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    • 2. 发明授权
    • Sulfated gums and method of producing same
    • 硫化体系及其生产方法
    • US3720659A
    • 1973-03-13
    • US3720659D
    • 1971-02-09
    • MARINE COLLOIDS INC
    • GUISELEY KWHITEHOUSE P
    • C08B13/00C08B37/00C08B37/06C08B37/14C08B19/02C08B19/12
    • C08B37/0045C08B13/00C08B37/0039C08B37/0087C08B37/0093C08B37/0096
    • A CARBOLHYDRATE GUM IS SUBJECTED TO ANHYDROUS SULFATION WITH A SULFATING AGENT IN THE FORM OF A REACTION PRODUCT OF SULFUR TRIOXIDE WITH A LEWIS BASE. THE GUM IS PRODUCED IN A WATER-CONTAINING, WATER-DISTENDED CONDITION BY COAGULATION FROM SOLUTION OR BY SWELLING IN AN AQUEOUS MEDIUM AND WATER AND ANY LIQUID IRREVERSIBLY REACTIVE WITH THE SULFATING AGENT ARE REPLACED BY A SURROGATE LIQUID THAT HAS A VAPOR PRESSURE SUBSTANTIALLY LOWER THAN THAT OF WATER AND ANY OTHER LIQUID CARRIED BY THE PARTICLES THAT IS IRREVERSIBLY REACTIVE WITH THE SULFATING AGENT, SAID SURROGATE LIQUID BEING MISCIBLE WITH THE WATER AND WITH SAID OTHER LIQUID, BY SLURRYING THE PARTICLES WITH THE SURROGATE LIQUID AND EVAPORATING THE LIQUID MEDIUM UNTIL THE WATER AND ANY REACTIVE LIQUID ARE REMOVED BUT LEAVING SURROGATE LIQUID ASSOCIATED WITH THE PARTICLES. THE SURROGATE LIQUID IS EITHER THE SAME AS OR IS MISCIBLE WITH THE SOLVENT THAT IS USED FOR THE SULFATING AGENT. THE PROCESS IS ONE HAVING GENERAL APPLICABILITY TO CARBOHYDRATE GUMS SO AS TO IMPART IMPROVED RECEPTIVITY TO SULFATION WITHOUT EXCESSIVE DEGRADATION. DEGRADATION ALSO IS MINIMIZED BY CARRYING OUT THE SULFATION IN THE PRESENCE OF A BASE. PREDETERMINED DEGREES OF SULFATION ARE MADE POSSIBLE BY TEMPERATURE CONTROL AND NEW SULFATED GUM PRODUCTS ARE AFFORDED WHICH MAY BE PRODUCED SO AS TO HAVE PROPERTIES HAVING SPECIFIC UTILITIES FOR DIFFERENT COMMERCIAL APPLICATIONS, THE END PRODUCTS HAVING ESPECIAL ADVANTAGES FOR USE IN MILK PRODUCTS.
    • 9. 发明授权
    • Titanium dioxide suspensions
    • 二氧化钛悬浮液
    • US3663284A
    • 1972-05-16
    • US3663284D
    • 1970-01-09
    • MARINE COLLOIDS INC
    • STANCIOFF DIMITRI JWITT HENRY J
    • C09D17/00C09C1/36
    • C09D17/008
    • For facilitating handling and shipment titanium dioxide pigment is prepared in the form of an aqueous suspension wherein the concentration of the titanium dioxide is from about 40 percent to about 80 percent by weight of the suspension and as an agent which retards settling and packing there is included in the suspension about 0.04 percent to about 0.4 percent by weight of the suspension a water-soluble additive selected from the group of substances consisting of citric acid, tartaric acid, the sodium, potassium and ammonium salts and acid salts of citric and tartaric acids, and mixtures of said substances with each other. Preferably, as an agent which further retards settling, there is included in the suspension a gum that is in an amount not greater than about 0.4 percent by weight of the suspension and that in the amount used does not induce substantial gelation of the suspension. It likewise is preferable to include in the suspension from about 0.01 percent to about 0.1 percent by weight of the suspension of a sequestering agent for calcium cations.
    • 为了便于处理和运输,二氧化钛颜料以水性悬浮液的形式制备,其中二氧化钛的浓度为悬浮液的约40重量%至约80重量%,并且作为延迟沉降和包装的试剂包括 在悬浮液中约0.04重量%至约0.4重量%的悬浮液,一种水溶性添加剂,其选自柠檬酸,酒石酸,柠檬酸和酒石酸的钠,钾和铵盐以及酸性盐组成的物质组, 以及所述物质彼此的混合物。 优选地,作为进一步延迟沉降的试剂,在悬浮液中包含不大于悬浮液重量的约0.4%的量的胶,并且所用量不会引起悬浮液的实质胶凝。 同样优选在悬浮液中包含约0.01重量%至约0.1重量%的钙阳离子螯合剂的悬浮液。